(Red Hat Issues Fix for RHEL) Kerberos 5 ASN.1 Decoder Infinite Loop Lets Remote Users Deny Service
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SecurityTracker Alert ID: 1011114 |
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SecurityTracker URL: http://securitytracker.com/id/1011114
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CVE Reference:
CAN-2004-0644
(Links to External Site)
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Date: Aug 31 2004
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Impact:
Denial of service via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): prior to 1.2.2-31
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Description:
A denial of service vulnerability was reported in Kerberos 5 in the ASN.1 decoder library. A remote user can cause a Key Distribution Center (KDC) or an application server to enter an infinite loop.
The vendor reported that if the ASN.1 SEQUENCE type was encoded with an indefinite length, the asn1bug_snc() function will attempt to skip any trailing unrecognized fields with the asn1buf_skiptail() function. The asn1buf_skiptail() function does not properly handle certain error conditions and may enter an infinite loop.
The vendor credits Will Fiveash and Nico Williams at Sun with discovering this vulnerability.
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Impact:
A remote user can cause the KDC or application server to enter an infinite loop.
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Solution:
Red Hat has released a fix.
Red Hat Enterprise Linux AS (Advanced Server) version 2.1:
SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/krb5-1.2.2-31.src.rpm
908bd9ee7963203d5c086e25b0849568 krb5-1.2.2-31.src.rpm
i386:
f5fc294848750e1186efd792aaca3fa1 krb5-devel-1.2.2-31.i386.rpm
1da2499c2aa50026be1eda1774cb8fc0 krb5-libs-1.2.2-31.i386.rpm
72749007a7033ff2a31dc4ee20a439c7 krb5-server-1.2.2-31.i386.rpm
be44496d6d25c3e5c1754ce871b3de49 krb5-workstation-1.2.2-31.i386.rpm
ia64:
d81f70e064675a486c9a796fd1ea6297 krb5-devel-1.2.2-31.ia64.rpm
bd5eeae1a8d4b97585bbe67b746edb1d krb5-libs-1.2.2-31.ia64.rpm
bb30a6820d6c475452458a3cebca55b8 krb5-server-1.2.2-31.ia64.rpm
c7b3177d7e82f890ef669196c2ff0f8f krb5-workstation-1.2.2-31.ia64.rpm
Red Hat Linux Advanced Workstation 2.1:
SRPMS:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/krb5-1.2.2-31.src.rpm
908bd9ee7963203d5c086e25b0849568 krb5-1.2.2-31.src.rpm
ia64:
d81f70e064675a486c9a796fd1ea6297 krb5-devel-1.2.2-31.ia64.rpm
bd5eeae1a8d4b97585bbe67b746edb1d krb5-libs-1.2.2-31.ia64.rpm
bb30a6820d6c475452458a3cebca55b8 krb5-server-1.2.2-31.ia64.rpm
c7b3177d7e82f890ef669196c2ff0f8f krb5-workstation-1.2.2-31.ia64.rpm
Red Hat Enterprise Linux ES version 2.1:
SRPMS:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/krb5-1.2.2-31.src.rpm
908bd9ee7963203d5c086e25b0849568 krb5-1.2.2-31.src.rpm
i386:
f5fc294848750e1186efd792aaca3fa1 krb5-devel-1.2.2-31.i386.rpm
1da2499c2aa50026be1eda1774cb8fc0 krb5-libs-1.2.2-31.i386.rpm
72749007a7033ff2a31dc4ee20a439c7 krb5-server-1.2.2-31.i386.rpm
be44496d6d25c3e5c1754ce871b3de49 krb5-workstation-1.2.2-31.i386.rpm
Red Hat Enterprise Linux WS version 2.1:
SRPMS:
ftp://updates.redhat.com/enterprise/2.1WS/en/os/SRPMS/krb5-1.2.2-31.src.rpm
908bd9ee7963203d5c086e25b0849568 krb5-1.2.2-31.src.rpm
i386:
f5fc294848750e1186efd792aaca3fa1 krb5-devel-1.2.2-31.i386.rpm
1da2499c2aa50026be1eda1774cb8fc0 krb5-libs-1.2.2-31.i386.rpm
72749007a7033ff2a31dc4ee20a439c7 krb5-server-1.2.2-31.i386.rpm
be44496d6d25c3e5c1754ce871b3de49 krb5-workstation-1.2.2-31.i386.rpm
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Vendor URL: web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2004-003-asn1.txt (Links to External Site)
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Cause:
State error
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Underlying OS:
Linux (Red Hat Enterprise)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Tue, 31 Aug 2004 13:35 -0400
Subject: [RHSA-2004:448-01] Updated krb5 packages fix security
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
- ---------------------------------------------------------------------
Red Hat Security Advisory
Synopsis: Updated krb5 packages fix security vulnerabilities
Advisory ID: RHSA-2004:448-01
Issue date: 2004-08-31
Updated on: 2004-08-31
Product: Red Hat Enterprise Linux
Keywords: krb5 double-free asn.1
Obsoletes: RHSA-2004:236
CVE Names: CAN-2004-0642 CAN-2004-0643 CAN-2004-0644
- ---------------------------------------------------------------------
1. Summary:
Updated Kerberos (krb5) packages that correct double-free and ASN.1
parsing bugs are now available for Red Hat Enterprise Linux.
2. Relevant releases/architectures:
Red Hat Enterprise Linux AS (Advanced Server) version 2.1 - i386, ia64
Red Hat Linux Advanced Workstation 2.1 - ia64
Red Hat Enterprise Linux ES version 2.1 - i386
Red Hat Enterprise Linux WS version 2.1 - i386
3. Problem description:
Kerberos is a networked authentication system that uses a trusted third
party (a KDC) to authenticate clients and servers to each other.
Several double-free bugs were found in the Kerberos 5 KDC and libraries. A
remote attacker could potentially exploit these flaws to execute arbitrary
code. The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the names CAN-2004-0642 and CAN-2004-0643 to these issues.
A double-free bug was also found in the krb524 server (CAN-2004-0772),
however this issue was fixed for Red Hat Enterprise Linux 2.1 users by a
previous erratum, RHSA-2003:052.
An infinite loop bug was found in the Kerberos 5 ASN.1 decoder library. A
remote attacker may be able to trigger this flaw and cause a denial of
service. The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CAN-2004-0644 to this issue.
All users of krb5 should upgrade to these updated packages, which contain
backported security patches to resolve these issues.
4. Solution:
Before applying this update, make sure that all previously-released
errata relevant to your system have been applied. Use Red Hat
Network to download and update your packages. To launch the Red Hat
Update Agent, use the following command:
up2date
For information on how to install packages manually, refer to the
following Web page for the System Administration or Customization
guide specific to your system:
http://www.redhat.com/docs/manuals/enterprise/
5. Bug IDs fixed (http://bugzilla.redhat.com/ for more info):
129680 - Upgrading to krb5-libs 1.2.2-27 can cause undefined symbol __dn_expand
6. RPMs required:
Red Hat Enterprise Linux AS (Advanced Server) version 2.1:
SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/krb5-1.2.2-31.src.rpm
908bd9ee7963203d5c086e25b0849568 krb5-1.2.2-31.src.rpm
i386:
f5fc294848750e1186efd792aaca3fa1 krb5-devel-1.2.2-31.i386.rpm
1da2499c2aa50026be1eda1774cb8fc0 krb5-libs-1.2.2-31.i386.rpm
72749007a7033ff2a31dc4ee20a439c7 krb5-server-1.2.2-31.i386.rpm
be44496d6d25c3e5c1754ce871b3de49 krb5-workstation-1.2.2-31.i386.rpm
ia64:
d81f70e064675a486c9a796fd1ea6297 krb5-devel-1.2.2-31.ia64.rpm
bd5eeae1a8d4b97585bbe67b746edb1d krb5-libs-1.2.2-31.ia64.rpm
bb30a6820d6c475452458a3cebca55b8 krb5-server-1.2.2-31.ia64.rpm
c7b3177d7e82f890ef669196c2ff0f8f krb5-workstation-1.2.2-31.ia64.rpm
Red Hat Linux Advanced Workstation 2.1:
SRPMS:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/krb5-1.2.2-31.src.rpm
908bd9ee7963203d5c086e25b0849568 krb5-1.2.2-31.src.rpm
ia64:
d81f70e064675a486c9a796fd1ea6297 krb5-devel-1.2.2-31.ia64.rpm
bd5eeae1a8d4b97585bbe67b746edb1d krb5-libs-1.2.2-31.ia64.rpm
bb30a6820d6c475452458a3cebca55b8 krb5-server-1.2.2-31.ia64.rpm
c7b3177d7e82f890ef669196c2ff0f8f krb5-workstation-1.2.2-31.ia64.rpm
Red Hat Enterprise Linux ES version 2.1:
SRPMS:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/krb5-1.2.2-31.src.rpm
908bd9ee7963203d5c086e25b0849568 krb5-1.2.2-31.src.rpm
i386:
f5fc294848750e1186efd792aaca3fa1 krb5-devel-1.2.2-31.i386.rpm
1da2499c2aa50026be1eda1774cb8fc0 krb5-libs-1.2.2-31.i386.rpm
72749007a7033ff2a31dc4ee20a439c7 krb5-server-1.2.2-31.i386.rpm
be44496d6d25c3e5c1754ce871b3de49 krb5-workstation-1.2.2-31.i386.rpm
Red Hat Enterprise Linux WS version 2.1:
SRPMS:
ftp://updates.redhat.com/enterprise/2.1WS/en/os/SRPMS/krb5-1.2.2-31.src.rpm
908bd9ee7963203d5c086e25b0849568 krb5-1.2.2-31.src.rpm
i386:
f5fc294848750e1186efd792aaca3fa1 krb5-devel-1.2.2-31.i386.rpm
1da2499c2aa50026be1eda1774cb8fc0 krb5-libs-1.2.2-31.i386.rpm
72749007a7033ff2a31dc4ee20a439c7 krb5-server-1.2.2-31.i386.rpm
be44496d6d25c3e5c1754ce871b3de49 krb5-workstation-1.2.2-31.i386.rpm
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://www.redhat.com/security/team/key.html#package
7. References:
http://web.mit.edu/kerberos/advisories/
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0642
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0643
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0644
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://www.redhat.com/security/team/contact.html
Copyright 2004 Red Hat, Inc.
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